129286272 has 32 divisors (see below), whose sum is σ = 343417680. Its totient is φ = 43095296.

The previous prime is 129286271. The next prime is 129286273. The reversal of 129286272 is 272682921.

It is an interprime number because it is at equal distance from previous prime (129286271) and next prime (129286273).

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 129286272.

It is not an unprimeable number, because it can be changed into a prime (129286271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167958 + ... + 168725.

Almost surely, 2^129286272 is an apocalyptic number.

129286272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

129286272 is an abundant number, since it is smaller than the sum of its proper divisors (214131408).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129286272 is an equidigital number, since it uses as much as digits as its factorization.

129286272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336700 (or 336688 counting only the distinct ones).

The product of its digits is 48384, while the sum is 39.

The square root of 129286272 is about 11370.4121297339. The cubic root of 129286272 is about 505.6509228740.

The spelling of 129286272 in words is "one hundred twenty-nine million, two hundred eighty-six thousand, two hundred seventy-two".